Worm-gearing.



J.. LBQOGHE. WORM GEABING. 'APPLIoATIoN rIILBD JULY 9. 1907..

968,574'. v Patented Aug.3o,191o.

2 SHEETS-,SHEET 1.

J. LBCOCHE. A

WORM GEARING.

APPLICATION TILED JULY 9, 1907.V

2 SHEETS-SHEET Z.

Patented Aug. 80, 1910.

To all whom 'it may concern.'

nais

y. JULESIECOCHE, OE EAST IUTNEY, ENGLAND.

WORM-GEARING^.

essere.

Application filed July 9, 1907. Serial No. 382,958.

Be it known that I, JULES Lncoonn, a citizen of the` French Republic, residing at 28 Mexiield road, East Putney, in the county of Surrey, in that part of the United King dom called England, have invented new and useful Improvements in Worm-Gearing, of which the following is a specification.

This invention relates to improvements in worm-gearing, the object being to increase the eiliciency by, decreasing the friction which in the ordinary worm gear is so great that. from forty to sixty per cent. of the power is lost and subsequent-ly Aonly a comparatively small percentage of efliciency isusefully available. lVith this invention, however, a much greater eitieiency can he obtained thus rendering this type of gear available where itwould not otherwise be' so; Further, this invention increases the durability ot the worm and worm-wheel considerably. beyond that of this type of gear as usually constructed which `wears out quickly and has'i'requently to be renewed.

This improvedgear is applicable to reducingr the speed of turbines, electric and other motors and machines, and to any purpose, Where an ordinary worm gear vwould be employed if it hadnot the defects for which my invention rovides a remedy. I do not therefore con me its use to any particular application.

In carrying my invention into edect, I decrease friction and consequent wear and loss of power by dimii'iishing or eliminating between the teeth by transmitting the Whole or part of the force4 necessary to drive the Wormfwhcel by means of magnetic attraction.

I construct the worm, trame and worm wheel so that a magncticcircuit isformed so that lines of magnetic-force pass from the thread of the worm to the teeth of the wheel or vice versa at or about at the points where the magnetic parts ot' the thread and teeth are in Contact.

The required magnetic power is provided either by permanent or electro-magnets, and

`in the latter `case the coils are disposed at suitable' points of the magnetic circuit and consequently may be applied lo the .traine or to the Spindle o't` the, worm or to that of the worm-wheel or toany or all of them.

In further explanation of my invention I make reference to the accompanying draw mg which shows a practicable and tested Iorm, in which electro-magnetism is made use of, but I do not confine myself to this one` formas the details can be varied to adapt the invention to given circumstances without departure Jfrom itsV essential features.

Referring to the drawings, Figure 14 shows a part sectional side View and Fig. 2, a vertical section .through the center of rig. 1..

a is the Worm wheel carried by the shaft I) running 111 bearings @which may form parts ot' a trarne or an outer casing d, and 4 which in. turn may be attached to or form part of a lower part of casing e havino' bearings at each end to carrythe shaiPt g of the worm it, and the lower part e may contain oil to form an oil bath. i 'l A portion ot' cach of the teeth of the worm wheel@ is made of non-1nagnetic material z', the other portion of each tooth being made of magnetic material j'as `is also vthe wheel itself with which the magnetic part of lthe teeth may be integral.

The worm la has a portion 'ot' its thread or ot' each of its threads made of non-mag notie material v, the other portion of the thread or threads being made of magneticmateria] The worm shaft g runs in two magnetic coils m attached to the end of the casingc and connected with a suitable source ot' electricity. The framing or casing in which are arranged the worm-gearing should be of good magnetic permeability so that the whole will form a magnetic circuit.

VIn use when theworm is revolved so as to rotate the worm wheel in the direction .of the arrow, and an electric current circu- Y lates through the coils, the magnetic part oi the thread of the worm in contactwith. the magnetic part-of a tooth of the worm` ranged than shown on the drawing, and for vthe casings may be substituted a suitable framing, and for the coils permanent magnets.

VWhat I claim and desire-to secure by Letters Patentlis:*

1. The combination with a Worm gearing, of means for transmitting the driving force by magnetic attraction. i

2. In a Worm gearing the combination of a Worm having a portion of each of its threads of non-magnetic material and a portion of magnetic material; magnets in which the shaft of the worm can revolve, a Wormwheel gearing With the said Worm and having portions of its teeth of nonmagnetic material and portions of magnetic material, I

the Whole arranged so that the lines of magnetic force pass from the Worm to the Worm- Wheel about at the pointsof contact between the Worm threads and the Worm-Wheel teeth.

In testimony whereof I have signed my JULES LECOCHE. Witnesses H. D. JAMESON, F. L. RAND.

zoy 

